surprisingly easy to update, was very smooth. Went from 5.2 to 5.4, then from 5.4 to 6.2. Even with my custom http/2 nginx configuration, it just worked, so thank you for the smooth upgrade experience.
Some feedback on the above matter: Yesterday I went ahead and setup the Proxmox Backup Server which required PVE to be updated to 6.2. So, I bit the bullet and performed this update. Everything is fine and there are no issues with VLANs and OVS